Characterization of guest molecule concentration dependent nanotubes of β-cyclodextrin and their secondary assembly: Study with trans-2-[4(dimethylamino)styryl]benzothiazole, a TICT-fluorescence probe

2009 ◽  
Vol 205 (2-3) ◽  
pp. 186-196 ◽  
Author(s):  
M. Sowmiya ◽  
Pradipta Purkayastha ◽  
Amit K. Tiwari ◽  
S. Syed Jaffer ◽  
Subit K. Saha
Keyword(s):  
Guest Molecule ◽  
Fluorescence Probe ◽  
Molecule Concentration ◽  
Secondary Assembly

Effects of Rhamnolipids on Enzymatic Hydrolysis of Bamboo Biomass and Mechanism

2020 ◽  
Vol 14 (4) ◽  
pp. 453-460
Author(s):  
Ruyi Sha ◽  
Zhan Yu ◽  
Zhenzhen Wang ◽  
Edwin Menledy Gbor ◽  
Ligang Jiang ◽  
...  
Keyword(s):  
Enzymatic Hydrolysis ◽  
Fluorescence Probe ◽  
Economic Losses ◽  
Dilute Acid ◽  
Site Of Action ◽  
The Stability ◽  
Surface Modified ◽  
Hydrolysis Of ◽  
Positive Effect

The lignin present in lignocellulose seriously affects the efficiency of cellulose enzymatic hydrolysis. In addition, lignin adsorbs high-cost cellulase, causing greater economic losses. Lignin can also disturb the site of action of cellulase and reduce the efficiency of hydrolysis. Therefore, if lignin is removed or surface modified before cellulose enzymatic hydrolysis, the enzymatic hydrolysis efficiency of lignocellulosic biomass will be greatly improved. In this paper, the cellulose enzymatic properties of bamboo biomass being treated with dilute acid and alkaline under the intervention of biosurfactant rhamnolipid were evaluated. The effects of rhamnolipids on the adsorption characterization of cellulose on pretreated bamboo were studied. Besides, the inter-communication between rhamnolipids and cellulose was investigated by fluorescence probe. The results showed that rhamnolipids could have a positive effect on the enzymatic hydrolysis of bamboo biomass by reducing the non-productive adsorption of cellulase on the surface of lignocellulose. The outcome illustrated that cellulase could be combined with rhamnolipids micelles, participating in the formation of rhamnolipids micelles, thereby increasing the internal hydrophobicity of the micelles, but could not change the properties of rhamnolipids micelles higher than one CMC (Critical Micelle Concentration). It can be seen that the interaction between rhamnolipids and cellulase is beneficial to enhance the stability and enzymatic activity of cellulase, thereby improving the enzymatic hydrolysis efficiency of cellulose in biomass. Based on these results, a theoretical knowledge about the mechanism of enhancing the enzymatic hydrolysis efficiency of lignocellulose by biosurfactants rhamnolipids is provided.

Spectroscopic characterization of 2-amino-N-hexadecyl-benzamide (AHBA), a new fluorescence probe for membranes

2006 ◽  
Vol 124 (2) ◽  
pp. 125-133 ◽  
Author(s):  
Cássia Alessandra Marquezin ◽  
Izaura Yoshico Hirata ◽  
Luiz Juliano ◽  
Amando Siuiti Ito
Keyword(s):  
Fluorescence Probe ◽  
Spectroscopic Characterization

Characterization of a fluorescence probe based on gold nanoclusters for cell and animal imaging

2013 ◽  
Vol 24 (5) ◽  
pp. 055704 ◽  
Author(s):  
Haiyan Chen ◽  
Bowen Li ◽  
Chuan Wang ◽  
Xin Zhang ◽  
Zhengqi Cheng ◽  
...  
Keyword(s):  
Fluorescence Probe ◽  
Gold Nanoclusters ◽  
Animal Imaging

Synthesis and Characterization of Methyl-Red/Layered Double Hydroxide (LDH) Nanocomposite

2009 ◽  
Vol 79-82 ◽  
pp. 493-496 ◽  
Author(s):  
Jian Qiang Liu ◽  
Xing Cheng Zhang ◽  
Wan Guo Hou ◽  
You Yong Dai ◽  
Hongdi Xiao ◽  
...  
Keyword(s):  
Layered Double Hydroxide ◽  
Lamellar Structure ◽  
Guest Molecule ◽  
High Thermal Stability ◽  
Reconstruction Method ◽  
Methyl Red ◽  
Element Analysis ◽  
Ft Ir ◽  
Double Hydroxide

In this paper, the intercalation of methyl-red (MR) into Mg/Al (ratio=2:1) layered double hydroxide (LDH) was carried out using reconstruction method to obtain MRLDH nanocomposite material. Its chemical composition, crystal structure and appearance were characterized by XRD, FT-IR, TEM, TG-DTA and element analysis. It has been found that the MRLDH still keeps the typical lamellar structure, and the guest MR has inserted into the layers of the host LDH. The MRLDH’s disassembly temperature is higher more than 70°C than that of guest molecule MR, so it can be used as a new dye with high thermal stability.

Characterization of natural gas hydrates by nuclear magnetic resonance and dielectric relaxation

1977 ◽  
Vol 55 (20) ◽  
pp. 3641-3650 ◽  
Author(s):  
D. W. Davidson ◽  
S. K. Garg ◽  
S. R. Gough ◽  
R. E. Hawkins ◽  
J. A. Ripmeester
Keyword(s):  
Guest Molecule ◽  
Continuous Wave ◽  
Type I ◽  
Tetrahedral Symmetry ◽  
Guest Molecules ◽  
Line Shapes ◽  
Dielectric Absorption ◽  
Dielectric Data ◽  
First Time

Continuous-wave proton nmr spectra of the clathrate hydrates and/or deuteriohydrates of methane, ethane, propane, isobutane, and neopentane–D2S have been recorded down to 2 K. Between 50 and 200 K each H2O hydrate spectrum consists of a line 3 to 4 G wide from reorienting guest molecules and a broader band from rigid water molecules. Line shapes characteristic of non-rotating guests are obtained in D2O hydrates at low temperatures, except for methane which gives a narrow line to 2 K. Neopentane, shown for the first time to be capable of enclathration, exhibits a Resing effect and other features related to its tetrahedral symmetry. Low-temperature dielectric absorption from reorienting guest-molecule dipoles has been measured in H2S, propane, isobutane, and n-butane–H2S hydrates. For steric reasons n-butane is encaged as a gauche rather than the trans isomer. Average barriers to reorientation estimated from nmr and dielectric data are 1.2 kcal/mol for ethane in type I hydrate and 0.6, 1.2, 1.4, and 0.8 kcal/mol for propane, isobutane, n-butane, and neopentane in type II.

Characterization of Apolipoprotein A-I Structure Using a Cysteine-Specific Fluorescence Probe†

Biochemistry ◽  
2000 ◽  
Vol 39 (47) ◽  
pp. 14682-14691 ◽  
Author(s):  
M. Alejandra Tricerri ◽  
Andrea K. Behling Agree ◽  
Susana A. Sanchez ◽  
Ana Jonas
Keyword(s):  
Fluorescence Probe ◽  
Specific Fluorescence ◽  
Apolipoprotein A
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